Room temperature, hot summer, "24V DC Cooling Fan" of speed relative after another. In this case, the user can try auxiliary cooling system, using laptop external convection air cooling, air conditioning if you can be in the room, the effect will be better. In addition, when the user performs a large application or game, "24V DC Cooling Fan" speed will be improved. If you issue a whirring sound long, most likely from dust or friction between the shaft with bearings, it is recommended on a regular basis "24V DC Cooling Fan" to remove dust or grease-related after-sales maintenance.